Toothbrush



FIG. 1 is a perspective view of a toothbrush embodying my new design;

FIG. 2 is a side elevational view thereof; the opposite side elevational view being a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left end elevational view thereof; and

FIG. 6 is a right end elevational view thereof. 

The ornamental design for a toothbrush, as shown and described. 